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ntp: get TX timestamp after authentication

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If the daemon transmit timestamp is saved for processing of a future
response or responding in the interleaved mode, get a more accurate
timestamp right before calling NIO_SendPacket(). Avoid unnecessary
reading of the clock for the transmit timestamp in the packet (i.e.
in interleaved modes and client basic mode).

This should improve accuracy and stability when authentication is
enabled in the client and symmetric basic modes and also interleaved
modes if kernel/hardware timestamps are not available.
This commit is contained in:
Miroslav Lichvar
2020-07-02 15:18:23 +02:00
parent 4e747da4b4
commit ff03b813b0
2 changed files with 29 additions and 21 deletions
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9
doc/chrony.conf.adoc
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@@ -200,10 +200,11 @@ authenticated source to be safely combined with unauthenticated sources in
order to improve the accuracy of the clock. They can be selected and used for
synchronisation only if they agree with the trusted and required source.
*xleave*:::
This option enables an interleaved mode which enables the server to
send transmit timestamps captured after the actual transmission (e.g. when the
server is running *chronyd* with software (kernel) or hardware
timestamping). This can significantly improve the accuracy of the measurements.
This option enables the interleaved mode of NTP. It enables the server to
respond with more accurate transmit timestamps (e.g. kernel or hardware
timestamps), which cannot be contained in the transmitted packet itself and
need to refer to a previous packet instead. This can significantly improve the
accuracy and stability of the measurements.
+
The interleaved mode is compatible with servers that support only the basic
mode. Note that even